基于IBIS模型的东北森林净第一性生产力模拟

Simulation of forest net primary productivity in northeastern China with IBIS

集成生物圈模型(the integrated biosphere simulator,IBIS)作为目前最复杂的基于动态植被模型的陆面生物模型之一,已经成为模拟大尺度(全球区域)的植被地理分布、净第一性生产力和碳平衡以及预测气候变化对陆地生态系统潜在影响的有效工具。应用IBIS模型对2004～2005年大小兴安岭的植被净第一性生产力(netprimaryproductivity,NPP)进行了定量估算,模拟与研究了大小兴安岭森林生态系统植被NPP的空间分布格局以及不同植被类型的NPP季节变化特征,结果表明:大小兴安岭森林植被年均NPP值为494.7gCm-.2a-1,年吸收0.06Pg的大气碳。研究区年均NPP的空间分布主要受热量条件的影响,大兴安岭地区基本上呈现出由北向南增加的趋势,小兴安岭地区除单位面积年均NPP大于1.1kgCm-2.a-1在小兴安岭北部孙吴和逊克地区分布外,基本上呈现出均匀分布的趋势。加强基础数据研究的同时如何根据中国的实际合理确定模型参数,使模型在我国典型生态系统中应用是值得进一步研究的。

The Integrated Biosphere Simulator （IBIS） is one of the most sophisticated models in simulating terrestrial biosphere processes based on dynamic vegetation schemes. IBIS have become a common means to simulate large-scale （from regional to global） vegetation distribution, net primary production and carbon cycle, and to predict potential consequences of climate change on the structure and functions of terrestrial ecosystems. In this study, using the inventory and meteorological data in Daxing＇anling and Xiaoxing＇anling of northeastern China during 2004-2005 and IBIS, we quantified the net primary production （NPP） and its spatio-temporal distribution in this region. The mean NPP was 494.7gCm^-2·a^-1, absorbing 0.06 PgC·a^-1 from the atmosphere in the whole region. The spatial distribution of the mean NPP was affected by heat regime, which increased from north to south in Daxing＇anling region, and well-distributed in Xiaoxing＇anling region except Sunwu and Xunke. Further studies are needed on rationally determining the IBIS model’s parameters for application of the IBIS model to typical ecosystems in China.